Light path diagnostics

Light path diagnostics

The light path diagnostics built into the server allow you to quickly identify the type of system error that occurred. The server is designed so that any LEDs that are illuminated remain illuminated when the server shuts down as long as the ac power source is good and the power supplies can supply +5V dc current to the server. This feature helps you isolate the problem if an error causes the server to shut down.

The light path diagnostics begin with the System Error LED on the information LED panel (see the illustration in 'Information LED panel'). When this light is illuminated, use the following information to isolate the problem.

•  If the System Error LED on the information LED panel  on the front of the server is on, a system error was  detected. Check to see which of the LEDs on the  diagnostics panel inside the server are on.
  
  
  •  Diagnostics panel LEDs off
     Error log is 75% full or more.
    Action:  PFA alert logged.
  •  Check System Error Log for additional information.
    
  •  SMI LED on
     A systems management event occurred.
    Action:  Restart the server.
     If the problem persists, go to General checkout.  Check System Error Log for additional information.
    
  •  NMI LED on
     A non-maskable interrupt occurred. The PCI 1  or PCI 2 LED will probably also be on.
    Actions: 
    1.  If the PCI 1 or PCI 2 LED is on, follow the instructions for those LEDs.
    2.  If the PCI 1 or PCI 2 LED is not on, restart the server.
    
     If the problem persists, go to General checkout.  Check System Error Log for additional information.
    
  •  PCI 1 LED on
     An error occurred on PCI primary bus 0. The adapter in PCI slot 5 or the system board  caused the error.
    Actions: 
    1.  Check the error log for additional information. If the error log  indicates a problem with the integrated ServeRAID controller or  the Ethernet controller, go to General checkout.
    2.  If you cannot determine that the adapter is failing from the  information in the error log, try to determine if it is failing by removing  the adapter from the PCI primary bus 0 (PCI slot 5) and restarting the server.
    
     If the problem persists, go to General checkout.
    
  •  PCI 2 LED on
     An error occurred on PCI primary bus 1. An adapter in PCI slot 1, 2, 3, or 4  or the system board caused the error.
    Actions: 
    1.  Check the error log for additional information.
    2.  If you cannot correct the problem from the information in the error log,  try to determine the failing adapter by removing one adapter at a time  from PCI primary bus 1 (PCI slots 1-4) and restarting the server after  each adapter is removed.
    
     If the problem persists, go to General checkout.
    
  •  CPU Wrong Slot LED on
     The combination of microprocessors and  terminator cards is not valid.
    Action:  Install the microprocessors in the  correct order. See Table 13 on page 240.
    
  •  MEM LED on  A memory error occurred.
    Actions: 
    1.  Check the DIMM Error LEDs on the memory board.
    2.  Replace the DIMM indicated by the lit DIMM Error LED.
    3.  Replace the memory board.
    
     If the problem persists, go to General checkout.
    
  •  FAN 1 LED on
     Fan 1 has failed or is operating too slowly.
    Note: A failing fan can also cause the TEMP and DASD1 LEDs to be on.
    Action:  Replace fan 1.
    
  •  FAN 2 LED on
     Fan 2 has failed or is operating too slowly.
    Note: A failing fan can also cause the TEMP and DASD1 LEDs to be on.
    Action:  Replace fan 2.
    
  •  FAN 3 LED on
     Fan 3 has failed or is operating too slowly.
    Note: A failing fan can also cause the TEMP and DASD1 LEDs to be on.
    Action:  Replace fan 3.
    
  •  FAN 4 LED on
     Fan 4 has failed or is operating too slowly.
    Note: A failing fan can also cause the TEMP and DASD1 LEDs to be on.
    Action:  Replace fan 4.
    
  •  TEMP LED on
     The system temperature has exceeded the maximum rating.
    Actions: 
    1.  Check to see if a fan has failed. If it has, replace the fan.
    2.  Make sure the room temperature is not too hot (see Specifications).
    
     If the problem persists, go to General checkout.
    
  •  VRM LED on
     One of the voltage regulator modules on the processor board has failed.
    Actions: 
    1.  Check the VRM Error LEDs on the processor board.
    2.  Turn off the server, reseat the VRM indicated by the lit VRM Error LED, and restart the server.
    3.  If the problem persists, replace the VRM.
    4.  Replace microprocessor for that VRM and the companion VRM (see Processor board component locations).
    5.  Replace processor board.
    
     If the problem persists, go to General checkout.
    
  •  CPU LED on
     One of the microprocessors has failed.
    Actions: 
    1.  Check the Microprocessor Error LEDs on the processor board.  Also, if possible, check the System Error Log for additional information.  If temperature problems are indicated in the log, check fans.
    2.  Turn off the server, reseat the microprocessor indicated by the lit  Microprocessor Error LED, and restart the server.
    3.  If the problem persists, replace the microprocessor.
    4.  Replace both VRMs for that microprocessor (see Processor board component locations).
    5.  Replace processor board.
    
     If the problem persists, go to General checkout.
    
  •  PS1 LED on
     The primary power supply has failed.
    Action:  Replace the primary power supply.
    
  •  PS2 LED on
     The secondary power supply has failed.
    Action:  Replace the secondary power supply.
    
  •  DASD 1 LED on
     A hot-swap hard disk drive has failed on SCSI  RAID channel 1.
    Actions: 
    1.  Check the error log for additional information. If the error log  indicates a temperature problem and the fans are working correctly, go to General checkout.
    2.  If the amber Hard Disk Status LED on one of the hot-swap hard disk  drives is on, see 'Controls and indicators' for more information.
    
    
  •  DASD 2 LED on
     A hot-swap hard disk drive has failed on SCSI RAID channel 2.
    Actions: 
    1.  Check the error log for additional information. If the error log  indicates a temperature problem and the fans are working correctly, go to General checkout.
    2.  If the amber Hard Disk Status LED on one of the hot-swap hard disk  drives is on, see 'Controls and indicators' for more information.
  
  
•  System Error LED on the information LED panel on  the front of the server is off. The light path diagnostics  have not detected a system error.

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